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Summary of significant accounting policies - Basis of preparation (Details)
12 Months Ended
Jun. 30, 2021
GBP (£)
item
person
Jun. 30, 2021
USD ($)
Jun. 30, 2020
GBP (£)
Jun. 30, 2020
USD ($)
COVID-19 pandemic        
Number of supporters for final home match | person 10,000      
Number of played matches deferred from previous fiscal year | item 10      
Cash resources £ 110,658,000   £ 51,539,000  
Borrowings 530,236,000   525,615,000  
Senior secured notes        
COVID-19 pandemic        
Notional amount | $   $ 425,000,000   $ 425,000,000
Borrowings 304,474,000   340,417,000  
Secured term loan facility        
COVID-19 pandemic        
Notional amount | $   $ 225,000,000   $ 225,000,000
Borrowings 160,575,000   179,593,000  
Revolving facilities        
COVID-19 pandemic        
Undrawn borrowing facilities 140,000,000   150,000,000  
Borrowings £ 60,000,000   £ 0